The Mitsubishi Electric MR-J2M-40D is a battery unit designed for use with the MR-JE-B series servo amplifiers. Its primary function is to provide backup power for retaining absolute position data, ensuring that encoder position information is preserved even when the main power supply is turned off. This battery module is specifically engineered to seamlessly integrate with MR-JE-B systems, offering reliable and long-term memory retention. The MR-J2M-40D helps maintain machine accuracy and operational continuity, making it an essential component for applications requiring absolute encoder feedback in industrial automation, such as CNC machinery, robotics, and precision positioning systems.